Hermann schumm



(No Model.)

H SGHUMM GAS 0R 011. MOTOR ENGINE.

No.` 528,115. Patented oct. 23, 1894.V

UNITED STATES s PATENT OFFICE.

HERMANN SCHUMM, OF OOLOGNE-DETZ, GERMANY, ASSIGNOR TO THEGAS-MOTOREN-FABRIK-DEUTZ, OF` SAME PLACE.

onsl oRoIl. MoToR- l-:NeINE SPECIFICATION forming part of Letters PatentN o. 528,115, dated October 23, 1894.

Applicationled February 21,1894. semina. 501,026. (naman.) Patented iiiswitzerland January 3, 1894, No. 7,730, in Belgium January5.1894,No.107,980, and `in Italy January 30, 1894,11XIX. 396.

To a/ZZ whom t may concern:

Be it known that I, HERMANN ScHUMM, a citizen of Switzerland, residingat Cologne- Deutz, in the German Empire, have invented new and usefulImprovements in Gas or Oil Motor-Engines, (for which I have obtainedLetters Patent in Switzerland,dated January 3, 1894, No. 7,730; inBelgium, dated January 5, 1894, No. 107,980, and in Italy, dated Jannary30, 1894, Vol. LXIX, 396,) of which the following is a specification.

In the specification to British Patent No. i

5,273,0f 1890, wasdescribed a construction of gas or oil motor engineswherein a diaphragm h or piston in a chamber communicating with the gasor air supply passages of the engine or with the engine cylinder itself,was caused, on the suction stroke of the engine piston, to actuate boththe discharge valve of the engine and the gas admission valve, so as toproperly control the action of these parts without the intervention of ashaft running at half the speed of the engine. My present inventionrelates to a modified construction of this device, more particularlyapplicable to oil lnotor engines, whereby it is rendered applicable forregulating the speed of the engine in a simple manner, which modifiedconstruction consists in the employment of one such flexible diaphragmand chamber for controlling the action of the oil supply pump of theengine, and a second such diaphragm and chamber for controlling theaction of the discharge valve. By this arrangement a very simple mode ofregulating the speed of the engine is obtained whereby, while thedischarge valve is prevented from being opened when the engine runs toofast, causing the combustion gases to be retained in the cylinder andalternately compressed and expanded, the oil pump is at the same timethrown out of action so that no combustible charge is introduced intothe cylinder. `With the use of a simple diaphragm for actuating bothdevices, as described in the said Patent No. 5,273, this mode ofregulation would not be appreciable because when the diaphragm isdeflected for preventing the discharge valve from opening, the oil pumpconnected to such diaphragm would be actuated by the latter,

gine in Which the oil is supplied by a pump my said invention with ref-`p into a vaporizing and mixing chamber o where it mixes'with the airsupply entering through pipe L, the resulting combustible mixture beingadmitted to the engine cylinder on the suction stroke of the piston,through the automatically opening admission valve q. The plunger of theoil pump has for this purpose hinged to it astem c which is in line withthe notched end of a rod b receiving vertical reciprocating motion froma cam or eccentric a on the engine shaft, while to the stem c is pivoteda rod connected to a flexible diaphragm h xed to a chamber g thatcommunicates by apipe 'i' with the air supply pipe L, the diaphragmbeing pressed outward by a spring so so as to tend to keep the stem cout of line with the rod b. The discharge valve j' of the engine haspivoted to its rod a stem c in line with the notched end of a rod breceiving vertical reciprocating motion from an eccentric or cam aontheengine shaft. To the stem c is pivoted a rod connected to a flexiblediaphragm h fixed on a chamber g, which communicates by a pipe 'L' withthe chamber o above the admission valve q. To the rod" 1J is pivoted aweighted lever m acted upon by a spring y holding it against a stop b2,and having a beak fn that faces the stem c.

The action of the engine thus constructed is as follows: On the downwardorsuction stroke of the engine piston, the resulting decrease ofpressure produced in O and L causes a corresponding decrease of pressurein the chamber g causing diaphragm h to be pressed inward by theatmosphere against spring and consequently to draw the stem c in linewith rod b so that on the then ensuing 11pstroke of the latter, theeccentric a forces up the plunger of the pump p, whereby a charge of oilis injected into the vaporizing chamber, mixing with the air and passinginto the cylinder through valve q. At the same time IOO phragm h andstem c to be retracted during the whole of the suction or chargingstroke, and for an appreciable time after the commencement of thecompression stroke, as it will take some time for the full atmosphericpressure to re-enter the chamber O, small pipe ft and chamber g, so thatwhen at the commencement of the compression stroke the eccentric rodadvances toward c, this will still be suiciently retracted to escape thenotched end of h2, and the discharge valve f will remain closed, andallow the charge to be compressed. This charge. is then compressed bythe upstroke of the piston, is then iired and the Working down stroke isperformed while at the same time as full atmospheric pressure has againentered chamber g', spring 0c in pressing h outward, moves c out of linewith b. At the completion of the downstroke the eccentric ot in forcingthe rod b against the stem c of valvef, opens the latter so as to allowthe combustion gases to escape. This action continues so long as thespeed is normal. When the engine runs too fast, the inertia of theweighted lever m causes it to lag behind during the upstroke of rod b,whereby beak n is made to press stem c to the right-hand, against theaction of spring so as to bring the stem out of line with the rod b, andconsequently the valvefis not opened during the return stroke of thepiston, which is thus made to compress the combustion gases. On thefollowing outstroke of the piston these gases expand again, and therebeing no suction action there is no reduction of pressure in O, L, and gand consequently the spring no maintains the stern c in the position outof line with the rod b', so that the oil pump p is not actuated. Thisaction continues until the speed of the engine is reduced to the normalagain, when the described action of lever m ceasing, the discharge valvewill again be opened by the eccentric a, and a fresh combustible chargeWill be introduced at the suction stroke. The plunger 0f the pump pafter having been forced upward by the eccentric a is moved down againto its original position against a stop by a spring m2.

It is obvious that in place of the flexible diaphragms h h and chambersg g small cylinders and pistons may be used, also that in place of apump p any equivalent device for introducing combustible fluid underpressure into the mixing chamber may be em ployed.

. Having thus described the nature of my invention andthe best means Iknow for carrying the same into practical effect, Iclaim- 1.- In a fourstroke cycle gas or oil motor engine the combination of an oil pump orequivalent device for introducing combustible fluid under pressure intothe mixing chamber, an eccentric cam or crank on the engine shaft foractuating` such device, through the medium of a stem pivoted to suchdevice, a chamber communicating with the mixing chamber or air supplypipe, and containing a flexible diaphragm or equivalent device connectedto said stem and acted upon by a spring causing it to move said stem outofv line with the eccentric, substantially as and for the purposesdescribed.

2. In a four stroke cycle gas or oil motor engine,the combinationofanoilpump or equivalent device for introducing combustible fluid underpressure into the mixing chamber, and controlled by the flexiblediaphragm acharnber communicating with the mixing chamber or air supplypipe of the engine, so as to sup ply combustible uid to the mixingchamber during the suction stroke, a discharge valve for the combustiongases actuated by aneccentric crank or cam on the engine shaft throughthe medium of a pivoted stem on the valve spindle, a iiexible diaphragmconnected to said pivoted stem and fixed on a chamber communicating withthe mixing chamber or air supply pipe of the engine, a spring tending tokeep the pivoted stem in line with the rod of the eccentric, and agovernor device acting upon the said pivoted stem so as to maintain thisout of line with the eccentric ro`d when the engine is running too fast,substantially as described.

In testimony whereof I have signed my name to this specification, inthepresence of two subscribing witnesses, this 3d day of February, A. D.1894.

HERMANN SOHUMINI.

Witnesses:

FRITZ SCHRDER, SOPHIE NAGEL.

